I am not checking my email all day, and due to the last minute nature of this entire business, it’s could be easy to miss a same or next day booking. Also, I need to be able to know when guests have messaged me. What if it’s urgent and I don’t check my email until tomorrow? Also, sometimes if my house is empty, I’ve been flexible with the cleaning schedule. It’s even possible for someone to book through host share and the house isn’t ready. Immediate messaging through the app seems like a huge priority.